Key layout for a telephone handset



FIG. 1 is a top, front, left side perspective view of a key layout for a telephone handset showing my new design;

FIG. 2 is a front elevational view thereof; and,

FIG. 3 is a bottom, front, right side perspective view thereof.

The dotted lines showing the outline of a telephone handset is for illustration purposes only and forms no part of the claimed invention. 

The ornamental design for a "key layout for a telephone headset", as shown and described. 